A large patch of darkness surrounded by many stars is probably a:
A. Black Dwarf
B. Bok Globule
C. Brown Dwarf
D. None of the above
E. Black Hole
Ans: B. Bok Globule
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A copper bar (d 5 10 mm, E 5 110 GPa) is loaded by tensile load P 5 11.5 kN. The maximum shear stress in the bar is approximately:
(A) 73 MPa
(B) 87 MPa
(C) 145 MPa
(D) 150 MPa
Consider two charged spheres, one with charge +2 C and the other with ?2 C. A proton (a positively charged particle) is at the point halfway between the spheres. What is not zero?
a. the potential energy of the proton b. the work to move the proton from infinity to that point c. the force on the proton d. all of the three above are zero
A nuclear reactor is said to be critical when the average number of neutrons from each fission event that cause(s) another fission event is
a. <1. b. 1. c. >1. d. any of the above. e. only (b) or (c) above.
General relativity explains the observed precession of the orbit of:
A) Pluto. B) Jupiter. C) Earth. D) Mercury. E) Io.